Dual Nickel- and Photoredox-Catalyzed Reductive Cross-Coupling of Aryl Halides with Dichloromethane via a Radical Process
作者:Wenhao Xu、Purui Zheng、Tao XU
DOI:10.1021/acs.orglett.0c03248
日期:2020.11.6
The first catalytic strategy to harness a new chloromethane radical from dichloromethane under dual Ni/photoredox catalytic conditions has been developed. Compared with traditional two-electron reductiveprocess associated with metallic reductants, this method via a single-electron approach can proceed under exceptionally mild conditions (visible light, ambient temperature, no strong base) and exhibits
Benzylation of arenes with benzyl ethers promoted by the in situ prepared superacid BF3–H2O
作者:Yu Li、Yan Xiong、Xueming Li、Xuege Ling、Ruofeng Huang、Xiaohui Zhang、Jianchun Yang
DOI:10.1039/c4gc00005f
日期:——
An efficient and environmentally friendly benzylation of arenes with benzyl ethers as benzyl donors using BF3âEt2O to generate in situ the superacid BF3âH2O as an efficient promotor has been described. A wide variety of functional groups have been investigated and found to be compatible to give the desired diarylmethanes in yields of up to 99%. The crucial role of the moisture content in this transformation has been demonstrated by detailed investigations.
In contrast to the recent breakthrough in electrochemical C–H aminations, the electrochemicallyoxidative C–N bondformation through a C–C bond cleavage is rarely studied. This work describes an electrochemical C–C amination of alkylarenes for the efficient synthesis of versatile anilines, as well as carbonyl compounds. With the cheap and durable graphite plates as electrodes, and in a simple undivided
A one-potsynthesis of diarylmethanes from air-stable diborylmethane via the Suzuki–Miyaura cross-coupling reaction is described. The present approach realizes the synthesis of various symmetrical and unsymmetrical diarylmethanes in good to excellent yields.
A novel palladium-catalyzed coupling reaction of an arylmethylketone with two molecules of an aryl halide to yield symmetric diarylmethanes is described. In the facile one-pot reaction, the arylmethylketone acts as a formal methylene donor. The experimental facts, including TLC monitoring, speculated intermediates as the raw materials, analysis of the cesium benzoate coproduct by ex situ IR spectroscopy